how should a ray of light be incident on a rectangular glass slab of so t it comes out from the opposite side of the slab without being displaced
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Answer:
You should incident the ray of light perpendicular (90 degree angle) to the glass slab so that it comes out from the the opposite face without being displaced. This happens because when we take angle of incident = 90degree , it fails the Snell's law
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It would be straight
It is slanting in such prism because at every point there is 15° decline in ray
But because of distance between walls of such a rectangle same phenomenon is not observed
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